Power for compute
Chip supply is not the constraint on AI infrastructure anymore. Power is. Britain shows the collision in one pair of numbers: a grid demand queue that has grown to 125GW against a peak of about 45GW. Every new megawatt now clears a queue built to ration scarcity, not a first-come, first-served line.
The grid year
GB transmission-connected fleet · Aug 2025 to Jul 2026Each dot is a plant on Great Britain's transmission-connected fleet for the year to July 2026, sized by capacity or metered output and coloured by fuel. Filter by technology, search by name or owner, or click through to a plant's own year: monthly output, capacity factor, hours online, and any data quality flag this desk carries in public. Below the map sit that year's generation mix by fuel, GB's net interconnector position, and where registered capacity and metered energy diverge across technologies.
Node radius is proportional to the square root of capacity (MW). 243 of 572 plants shown. Filled triangle: net import. Hollow triangle: net export (interconnectors, year total).
Monthly generation by source, GB fuel-type outturn (FUELHH), TWh
GB net interconnector position, all links summed, TWh/month, positive means net import
Capacity mix (registered MW)
81,472 of 111,190 MW geo-mapped (29,718 MW, 26.7% of registry, not individually plottable)
Energy mix (FUELHH, TWh)
The collision
Queue vs peak, the fee, the zones, the route-aroundThis atlas already states the constraint at the layer level. Power Generation (L3): "power availability now caps how much compute can actually run." Transmission & Grid (L4): "the interconnection queue now decides which data centres get built, not the GPU order book." Great Britain proves both claims at once.
GB's demand-connection queue grew from 41GW to 125GW between November 2024 and June 2025, and data centres account for roughly 73GW of it. GB's own peak electricity demand is about 45GW: a queue nearly three times the size of the system it would connect to, and it cannot clear itself. Something has to ration it.
Two reforms do the rationing. NESO's TMO4+/Gate 2 queue logic, live since 10 June 2025, replaced first-come-first-served with "first ready, first needed, first connect." Ofgem is layering a second, demand-side reform on top: a consultation running 29 July to 16 September 2026 proposes a refundable Data Centre Commitment Fee of £237,500 to £712,500 per MW, forfeited if a project stalls. The goal is to push speculative queue-holders out.
Actual connected UK data centre demand today is small next to the queue: 7.6TWh from 2.4GW, mostly legacy enterprise load rather than AI. NESO's own Future Energy Scenarios model that growing to roughly 20TWh and 5.2GW by 2030, 33TWh and 5.4GW by 2035, and a wide 30 to 71TWh and 4.9 to 11.5GW range by 2050. NESO attributes that spread to a single unknown: how much AI investment lands in Britain rather than in a competing market.
Policy state
Data centres became UK Critical National Infrastructure on 12 September 2024, the first new CNI sector designation in almost a decade. The status gives prioritised access to the National Cyber Security Centre and emergency services. It does not change planning law, tax treatment, or grid priority.
DSIT's January 2026 progress report lists five AI Growth Zones: Culham in Oxfordshire (100MW scaling to 500MW), North East England (Cambois/Blyth and Cobalt Park, Newcastle), North Wales (Prosperity Parc, Anglesey, backed by the Wylfa SMR site), South Wales (Bridgend, run by Vantage), and Lanarkshire in Scotland (Airdrie, DataVita, a 500MW target with CoreWeave named as a cloud partner).
The Infrastructure Planning (Business or Commercial Projects) (Amendment) Regulations 2026 added data centres to the projects a developer can route through the Nationally Significant Infrastructure Projects regime, in force since 8 January 2026. The route is discretionary: developers request it, and the regulations set no statutory MW threshold. Only three schemes had sought a direction by July 2026: Wapseys Wood in Buckinghamshire, Quest Park in Bedford, and Ebbsfleet in Dartford.
Behind-the-meter gas is the fastest route around the queue. Ofgem counts roughly 117 active cases and enquiries from developers seeking to connect proposed data centres to the gas network instead of, or ahead of, a grid connection. A narrower count from the Institution of Gas Engineers and Managers, dated April 2026, finds 46 formal applications in the gas networks' own pipeline, of which 7 are secured, totalling 15.4TWh.
The Review of Electricity Market Arrangements rejected zonal wholesale pricing on 10 July 2025, keeping a single national price. That removed the clearest locational signal that would have favoured cheaper, less congested sites such as Scotland over the congested South East.
One figure on this page carries a flag rather than a clean number. UK industrial electricity is often cited at roughly four times US and Nordic levels, but that comparator has not been checked against its own primary source. A narrower cross-check of published UK and Nordic tariffs implies a smaller gap of roughly 2.2 to 3 times. Read the 4x figure as directional, not settled (to-verify).
Key numbers
| Metric | Value | Source | Date |
|---|---|---|---|
| GB demand-connection queue | 125GW, up from 41GW between Nov 2024 and Jun 2025 | Ofgem / NESO | 2025-06 |
| Data centre share of the queue | ~73GW | Ofgem / NESO | 2025-06 |
| GB peak electricity demand | ~45GW | Ofgem / NESO | 2025-06 |
| Data centres with financial commitment and an FID | 71 of ~140 seeking connection (~20GW of ~50GW sought) | NESO Demand Queue Call for Input, via Greenberg Traurig | 2026-06 |
| Connected UK data centre demand today | 7.6TWh from 2.4GW | NESO | 2025 |
| NESO Future Energy Scenarios, UK data centre demand | ~20TWh/5.2GW by 2030; 33TWh/5.4GW by 2035; 30-71TWh/4.9-11.5GW by 2050 | NESO Future Energy Scenarios | 2025 |
| Data Centre Commitment Fee (consultation) | £237,500 to £712,500 per MW, refundable, forfeited if a project stalls | Ofgem | 2026-07-29 |
| Queue reform | TMO4+ / Gate 2 ("first ready, first needed, first connect") live from 10 Jun 2025 | NESO | 2025-06-10 |
| Behind-the-meter gas route-around | Ofgem: ~117 cases and enquiries. IGEM: 46 formal applications, 7 secured, 15.4TWh | GT Law and BCLP, citing Ofgem and IGEM | 2026-06 / 2026-04 |
| AI Growth Zones designated | 5: Culham, North East England, North Wales, South Wales, Lanarkshire | DSIT, "One Year On" | 2026-01 |
| NSIP section 35 schemes | 3 as of Jul 2026: Wapseys Wood, Quest Park, Ebbsfleet | legislation.gov.uk (SI 2026/13); MHCLG direction letters | 2026-07 |
| Critical National Infrastructure designation | 12 September 2024 | gov.uk | 2024-09-12 |
| Zonal pricing rejected (REMA) | Single national price retained | gov.uk | 2025-07-10 |
Go deeper
Contains BMRS data © Elexon Limited copyright and database right 2026.
Contains public sector information from NESO and the Department for Energy Security and Net Zero, licensed under the Open Government Licence v3.0.
Plant and interconnector data covers Great Britain's transmission-connected fleet only. Northern Ireland runs on a separate system (SONI) and sits outside this page's scope.
This page tracks market structure and public policy state. Nothing here is investment advice.